Boundedness for surfaces in weighted P^4

Ellingsrud and Peskine (1989) proved that there exists a bound on the degree of smooth non general type surfaces in P^4. The latest proven bound is 52 by Decker and Schreyer in 2000. In this paper we consider bounds on the degree of a quasismooth non-general type surface in weighted projective 4-space. We show that such a bound in terms of the weights exists, and compute an explicit bound in simple cases

Directors Guild of America Health Plan Eligibility: An IS Analysis and Design Case

The value of case studies and other active learning methodologies for teaching systems analysis, database design and program design have been acknowledged and empirically demonstrated. Appropriate case studies challenge students to think analytically and apply information systems concepts and tools to real-world situations. This paper presents a case study that facilitates students to hone their skills in developing data flow diagrams, data modeling, normalized data design, user interface design and modular program design. The case is well suited for a course in Systems Analysis and Design, Database or a course dealing with information systems Applications Development. Students are required to utilize their data flow, modeling and design skills to develop an appropriate data and program structure for the Directors Guild of America Health Plan. While the case realistically details the requirements for health coverage eligibility at DGA Health Plan, other system requirements have been simplified so that the case is not overwhelming. Student feedback indicates that the case is realistic, engaging and challenging without being excessively complex. The case has been used successfully as both group and individual projects. Suggested student deliverables include data flow and normalized entity-relationship diagrams, screen and report layouts, program structure chart and sample pseudo code

Motion Picture Industry Pension Plan: A Database Design Case

This teaching case addresses the design of a database that fulfills the complex requirements found at the Motion Picture Industry Pension Plan, an actual entity. With the goal of challenging students to think analytically and to apply information systems concepts and tools to real world situations, the case study was appropriately structured to reflect the complexities they are likely to encounter in actual practice. Expected student deliverables from the case include data flow diagrams, the database design, a sample data dictionary, a flowchart, and pseudo-code. Student feedback from field trials in two sections of an upper division Systems Analysis and Design course reveal that the case is effective in teaching system analysis and data design skills. Teaching notes, a discussion of teaching strategies for the case, and an appropriate case solution, including data flow diagrams (DFDs), an entity-relationship diagram (ERD), and a sample data dictionary, are available through the Journal of Information Systems Education website

Case Closed: Addressing Unmet Legal Needs & Stabilizing Families

This is the first of two articles that examines the role that advocates for parents and families can play in furthering the well-being and safety of children. This article highlights how the work of multidisciplinary advocacy teams with legal expertise can help prevent children from entering foster care. The next article will discuss emerging parent representation models that expedite the safe reunification of children already in foster care

Case Closed: Addressing Unmet Legal Needs & Stabilizing Families

This is the first of two articles that examines the role that advocates for parents and families can play in furthering the well-being and safety of children. This article highlights how the work of multidisciplinary advocacy teams with legal expertise can help prevent children from entering foster care. The next article will discuss emerging parent representation models that expedite the safe reunification of children already in foster care

Strange Bedfellows: How Child Welfare Agencies Can Benefit from Investing in Multidisciplinary Parent Representation

This is the second of a series of articles that examines the role that advocates for parents and families can play in furthering the wellbeing and safety of children. This article highlights emerging parent representation models that expedite the safe reunification of children already in foster care

Magnetic tests for magnetosome chains in Martian meteorite ALH84001

Transmission electron microscopy studies have been used to argue that magnetite crystals in carbonate from Martian meteorite ALH84001 have a composition and morphology indistinguishable from that of magnetotactic bacteria. It has even been claimed from scanning electron microscopy imaging that some ALH84001 magnetite crystals are aligned in chains. Alignment of magnetosomes in chains is perhaps the most distinctive of the six crystallographic properties thought to be collectively unique to magnetofossils. Here we use three rock magnetic techniques, low-temperature cycling, the Moskowitz test, and ferromagnetic resonance, to sense the bulk composition and crystallography of millions of ALH84001 magnetite crystals. The magnetic data demonstrate that although the magnetite is unusually pure and fine-grained in a manner similar to terrestrial magnetofossils, most or all of the crystals are not arranged in chains

Development of a computational testbed for numerical simulation of combustion instability

A synergistic hierarchy of analytical and computational fluid dynamic techniques is used to analyze three-dimensional combustion instabilities in liquid rocket engines. A mixed finite difference/spectral procedure is employed to study the effects of a distributed vaporization zone on standing and spinning instability modes within the chamber. Droplet atomization and vaporization are treated by a variety of classical models found in the literature. A multi-zone, linearized analytical solution is used to validate the accuracy of the numerical simulations at small amplitudes for a distributed vaporization region. This comparison indicates excellent amplitude and phase agreement under both stable and unstable operating conditions when amplitudes are small and proper grid resolution is used. As amplitudes get larger, expected nonlinearities are observed. The effect of liquid droplet temperature fluctuations was found to be of critical importance in driving the instabilities of the combustion chamber